const video = document.getElementById('video')

Promise.all([
    faceapi.nets.tinyFaceDetector.loadFromUri('  ../../models'),
    faceapi.nets.faceLandmark68Net.loadFromUri(' ../../models'),
    faceapi.nets.faceRecognitionNet.loadFromUri('../../models'),
    faceapi.nets.faceExpressionNet.loadFromUri(' ../../models')
]).then(startVideo)

function startVideo() {
    navigator.getUserMedia(
        { video: {} },
        stream => video.srcObject = stream,
        err => console.error(err)
    )
}

video.addEventListener('play', () => {
    const canvas = faceapi.createCanvasFromMedia(video);
    document.body.append(canvas);

    const displaySize = { width: video.videoWidth, height: video.videoHeight }; // 获取实际的视频尺寸
    faceapi.matchDimensions(canvas, displaySize);

    setInterval(async () => {
        const detections = await faceapi.detectAllFaces(video, new faceapi.TinyFaceDetectorOptions())
            .withFaceLandmarks()
            .withFaceExpressions();

        const resizedDetections = faceapi.resizeResults(detections, displaySize);
        canvas.getContext('2d').clearRect(0, 0, canvas.width, canvas.height);
        faceapi.draw.drawDetections(canvas, resizedDetections);
        faceapi.draw.drawFaceLandmarks(canvas, resizedDetections);
        faceapi.draw.drawFaceExpressions(canvas, resizedDetections);
    }, 100);
});
